Palladium-catalyzed regioselective synthesis of mono and bis(arylthiol) alkenes from propargyl carbonate and thiophenol
作者:Indranil Chatterjee、Gautam Panda
DOI:10.1039/d3ob00167a
日期:——
catalyzed regioselective reaction of propargylic carbonate with thiophenols and benzene selenol is described. Atom-economic addition of thiols to propargylic carbonates provides an excellent opportunity for effective processes. The reaction proceeds via hydrothiolation to produce mono(arylthiol) alkenes and hydrothiolation followed by Tsuji–Trost type substitution to form bis(arylthiol) alkenes through
Ketones 1 were converted to of-quaternary of-vinyl ketones 2 by a two-step formal allylic carbon insertion between ketone carbonyl and alpha carbons, which involves the reaction of 1 with propargyltitanium reagents, derived from propargyl carbonates 3 and a divalent titanium reagent Ti(O-i-Pr)(4)/2i-PrMgCl, and the following rearrangement of the resulting alpha-allenyl alcohols 4 with NBS. (c) 2008 Elsevier Ltd. All rights reserved.